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Asked: 2026-05-29T21:24:12+00:00

My questions are regarding Tasks and the Back Stack and not other aspects of

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My questions are regarding Tasks and the Back Stack and not other aspects of the implementation.

I have a simple application with two activities.

Activity 1: Display list of items. Click on item starts activity 2 for specified item

Activity 2: Download PDF for item and then display using ACTION_VIEW (application/pdf) intent

Any launch of the application should re-use the existing list activity (or create a new one). I don’t want multiple lists (that is, only one Tasks). (Is launchMode = singleTask on activity and implement onNewIntent() the right approach for this?)

Also, any click on detail should start the detail page which will only show a “downloading” status, once the downloading is done, the PDF viewer is launched and the detail activity is “finished”. The back button from PDF should go back to the list. (If I finish() the detail activity when I start the PDF viewer activity, will the detail activity just drop out of the back stack cleanly?)

The status bar notifications should re-launch the existing. (Should my intent be the same as the main applicaton launch just with Extra data for the details of the new data?)

The net result is that the Back Stack should only have 4 states, one being intermediate:, and the application should only ever be associated with one Task:

(activity 1)

(activity 1) => (activity 2 – downloading)

(activity 1) => (activity 2 – launching viewer) => (PDF viewer) intermediate

(activity 1) => (PDF Viewer)

Thanks,
Mike

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1 Answer

  1. Editorial Team

    Yay! I got a tumbleweed award for this 🙂

    To answer my own question, my approach seems to be working fine. Good job, Mike!

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